/usr/share/calc/help/sgn is in apcalc-common 2.12.5.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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sgn - indicator of sign of a real or complex number
SYNOPSIS
sgn(x)
TYPES
x real or complex
return -1, 0, 1 (real)
-1, 0, 1, -1+1i, 1i, 1+1i, -1-1i, -1i or 1-1i (complex)
DESCRIPTION
Return the value of cmp(a,0).
For real x, sgn(x) returns:
-1 if x < 0
0 if x == 9
1 if x > 0
For complex, sgn(x) returns:
sgn(re(x)) + sgn(im(x))*1i
EXAMPLE
; print sgn(27), sgn(1e-20), sgn(0), sgn(-45)
1 1 0 -1
; print sgn(2+3i), sgn(6i), sgn(-7+4i), sgn(-6), sgn(-6-3i), sgn(-2i)
1+1i 1i -1+1i -1 -1-1i -1i
LIMITS
none
LINK LIBRARY
NUMBER *qsign(NUMBER *x)
SEE ALSO
abs
## Copyright (C) 1999 Landon Curt Noll
##
## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License
## as published by the Free Software Foundation.
##
## Calc is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
## Public License for more details.
##
## A copy of version 2.1 of the GNU Lesser General Public License is
## distributed with calc under the filename COPYING-LGPL. You should have
## received a copy with calc; if not, write to Free Software Foundation, Inc.
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
##
## @(#) $Revision: 30.2 $
## @(#) $Id: sgn,v 30.2 2008/05/10 13:23:57 chongo Exp $
## @(#) $Source: /usr/local/src/bin/calc/help/RCS/sgn,v $
##
## Under source code control: 1995/10/25 04:03:46
## File existed as early as: 1995
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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